[Webkit-unassigned] [Bug 178519] New: Scrolling sometimes jumps around

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=178519

            Bug ID: 178519
           Summary: Scrolling sometimes jumps around
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: gns at gnome.org
                CC: bugs-noreply at webkitgtk.org

I noticed after updating to a more recent WebKitGTK+ that sometimes when I'm panning through a page using two-finger scrolling it will jump to the end of the page (or to the top if panning towards the top). I haven't investigated deeply yet, but I have a gut feeling it may be related to Bug 155750. I think the kinetic scrolling might be getting triggered with bad values. I added this debugging printf to the top of ScrollAnimationKinetic::start:

fprintf(stderr, "%s: %.2fx%.2f\n", __func__, velocity.x(), velocity.y());

It prints this when the jump happens:

start: -136363,47x534090,25

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